Collect your 2026 "World's Busiest Control Tower" KOSH challenge coin now! This striking blue challenge coin commemorates EAA AirVenture's iconic Oshkosh tower, featuring a detailed rendering of the KOSH tower top and the legendary AirVenture runway layout. A must-have for aviation enthusiasts and challenge coin collectors, this limited edition piece captures the spirit of the world's largest fly-in convention. Perfect for trading, displaying, or adding to your aviation memorabilia collection.